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參數(shù)資料
| 型號： | PPXY8300A6T1 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | Pressure Sensor |
| 英文描述： | DIFFERENTIAL, PEIZORESISTIVE PRESSURE SENSOR, RECTANGULAR, SURFACE MOUNT |
| 封裝： | SOIC-20 |
| 文件頁數(shù)： | 105/162頁 |
| 文件大小： | 4316K |
| 代理商： | PPXY8300A6T1 |
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MPXY8300 Series
Sensors
Freescale Semiconductor
47
SECTION 7 KEYBOARD INTERRUPT
The MPXY8300 Series has a KBI module with two keyboard interrupt inputs that share port A and internal SPI pins.
7.1.1
Features
The KBI features include:
Up to three keyboard interrupt pins with individual pin enable bits.
Each keyboard interrupt pin is programmable as falling edge (or rising edge) only, or both falling edge and low level (or
both rising edge and high level) interrupt sensitivity.
One software enabled keyboard interrupt.
Exit from low-power modes.
7.1.2
Modes of Operation
This section defines the KBI operation in wait, stop, and background debug modes.
7.1.2.1
KBI in Wait Mode
The KBI continues to operate in wait mode if enabled before executing the WAIT instruction. Therefore, an enabled KBI pin
(KBPEx = 1) can be used to bring the MCU out of wait mode if the KBI interrupt is enabled (KBIE = 1).
7.1.2.2
KBI in Stop Modes
The KBI operates asynchronously in stop3 mode if enabled before executing the STOP instruction. Therefore, an enabled KBI
pin (KBPEx = 1) can be used to bring the MCU out of stop3 mode if the KBI interrupt is enabled (KBIE = 1).
During either stop1 or stop2 mode, the KBI is disabled. In some systems, the pins associated with the KBI may be sources of
wake-up from stop1 or stop2, see the stop modes section in the Section 3. Upon wake-up from stop1 or stop2 mode, the KBI
module will be in the reset state.
7.1.2.3
KBI in Active Background Mode
When the microcontroller is in active background mode, the KBI will continue to operate normally.
7.1.3
Block Diagram
The block diagram for the keyboard interrupt module is shown Figure 7-1.
Figure 7-1 KBI Block Diagram
7.2
External Signal Description
The KBI input pins can be used to detect either falling edges, or both falling edge and low level interrupt requests. The KBI input
pins can also be used to detect either rising edges, or both rising edge and high level interrupt requests.
The signal properties of KBI are shown in Table 7-1.
DQ
CK
CLR
VDD
KBMOD
KBIE
KEYBOARD
INTERRUPT FF
KBACK
RESET
SYNCHRONIZER
KBF
STOP BYPASS
STOP
BUSCLK
KBIPEn
0
1
S
KBEDGn
KBIPE0
0
1
S
KBEDG0
KBIP0
KBIPn
KBI
INTERRUPT
REQUEST
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